Generating Control Information for use in Transmission with a Multimedia Stream to an Audiovisual Device

1. A method for generating control information for use in transmission with a multimedia stream to an audiovisual device, the method comprising: generating first control information, wherein the first control information is for configuring the audiovisual device to present a multimedia stream according to a first service type; generating a first data structure, wherein the first data structure comprises information about the first control information, wherein the first data structure specifies that the first control information is associated with the first service type; generating and transmitting a first plurality of packets, the first plurality of packets comprising a multimedia stream according to the first service type, the first control information, and the first data structure; generating second control information, wherein the second control information is for configuring the audiovisual device to present a multimedia stream according to a second service type; modifying the first data structure to include additional information about the second control information, wherein the modified first data structure specifies that the second control information is associated with the second service type, wherein the modified first data structure retains the information about the first control information; generating and transmitting a second plurality of packets, wherein the second plurality of packets comprise the modified first data structure, the first control information, a multimedia stream according to the first service type, the second control information, and a multimedia stream according to the second service type; wherein the first data structure is separate from the first control information.

2. The method of claim 1 , wherein the first control information is for configuring the audiovisual device to present the multimedia stream in a first manner; wherein the second control information is for configuring the audiovisual device to present the multimedia stream in a second manner.

3. The method of claim 1 , wherein the first data structure specifies one or more locations in the first plurality of packets where the first control information is located; wherein the modified first data structure specifies one or more locations in the second plurality of packets where the second control information is located.

4. The method of claim 1 , wherein the information about the first control information specifies one or more types and one or more locations of first commands in the first control information; wherein the additional information about the second control information specifies one or more types and one or more locations of commands in the second control information.

5. The method of claim 1 , wherein said modifying the first data structure comprises modifying a format of the first data structure; the method further comprising modifying information specifying a format of the first data structure to reflect said modifying the first data structure.

6. The method of claim 5 , wherein said modifying the information specifying the format of the first data structure comprises at least one of modifying version information of the modified first data structure or modifying size information of the modified first data structure.

7. The method of claim 1 , wherein said modifying the first data structure comprises modifying a format of the first data structure; wherein the first data structure comprises information specifying a format of the first data structure; the method further comprising modifying the information specifying the format of the first data structure in the modified first data structure to reflect said modifying the first data structure.

8. The method of claim 1 , further comprising: generating third control information, wherein the third control information is for configuring the audiovisual device to present a multimedia stream, wherein the third control information is generated according to a third service type; generating a second data structure to include information about the third control information; generating and transmitting a third plurality of packets, wherein the third plurality of packets comprise the modified first data structure, the first control information, a multimedia stream specified by the first control information, the second control information, a multimedia stream specified by the second control information, the third data structure, the third control information, and a multimedia stream specified by the third control information.

9. The method of claim 1 , wherein the first data structure comprises information identifying the first service type of the first control information and a location of the first control information, wherein the information identifying the first service type of the first control information and the location of the first control information is useable by an audiovisual device to ignore the first control information if the audiovisual device is not configured to parse the first service type of the first control information.

10. The method of claim 1 , wherein the first data structure is configured to be extensible to add additional information which relates to additional control information.

11. The method of claim 1 , wherein the first data structure comprises a plurality of fields, wherein at least one of the fields is extensible; wherein the at least one extensible field is extended by setting the value of the field to a specific value, wherein the specific value indicates to an audiovisual device that the extensible field is extended.

12. The method of claim 1 , wherein the first data structure is configurable to include additional information which relates to additional control information in subsequently generated packets.

13. A non-transitory computer-readable memory medium comprising program instructions for generating control information for use in transmission with a multimedia stream to an audiovisual device, wherein when executed by a device, the program instructions cause the device to: generate first control information, wherein the first control information is for configuring the audiovisual device to present a multimedia stream according to a first service type; generate a first data structure, wherein the first data structure comprises information about the first control information, wherein the first data structure specifies that the first control information is associated with the first service type; generate and transmit a first plurality of packets, the first plurality of packets comprising a multimedia stream according to the first service type, the first control information, and the first data structure; generate second control information, wherein the second control information is for configuring the audiovisual device to present a multimedia stream according to a second service type; modify the first data structure to include additional information about the second control information, wherein the modified first data structure specifies that the second control information is associated with the second service type, wherein the modified first data structure retains the information about the first control information; generate and transmit a second plurality of packets, wherein the second plurality of packets comprise the modified first data structure, the first control information, a multimedia stream according to the first service type, the second control information, and a multimedia stream according to the second service type; wherein the first data structure is separate from the first control information.

14. The memory medium of claim 13 , wherein the first data structure specifies one or more locations in the first plurality of packets where the first control information is located; wherein the modified first data structure specifies one or more locations in the second plurality of packets where the second control information is located.

15. The memory medium of claim 13 , wherein the information about the first control information specifies one or more types and one or more locations of first commands in the first control information; wherein the additional information about the second control information specifies one or more types and one or more locations of commands in the second control information.

16. The memory medium of claim 13 , wherein the first data structure comprises a plurality of fields, wherein at least one of the fields is extensible; wherein the at least one extensible field is extended by setting the value of the field to a specific value, wherein the specific value indicates to an audiovisual device that the extensible field is extended.

17. A device, comprising: a transmitter; a memory medium; and a processor operably coupled to the transmitter and the memory medium; wherein the processor, memory medium, and transmitter are configured to: generate first control information, wherein the first control information is for configuring an audiovisual device to present a multimedia stream according to a first service type; generate a first data structure, wherein the first data structure comprises information about the first control information, wherein the first data structure specifies that the first control information is associated with the first service type; generate and transmit a first plurality of packets, the first plurality of packets comprising a multimedia stream according to the first service type, the first control information, and the first data structure; generate second control information, wherein the second control information is for configuring the audiovisual device to present a multimedia stream according to a second service type; modify the first data structure to include additional information about the second control information, wherein the modified first data structure specifies that the second control information is associated with the second service type, wherein the modified first data structure retains the information about the first control information; generate and transmit a second plurality of packets, wherein the second plurality of packets comprise the modified first data structure, the first control information, a multimedia stream according to the first service type, the second control information, and a multimedia stream according to the second service type; wherein the first data structure is separate from the first control information.

18. The device of claim 17 , wherein the first data structure specifies one or more locations in the first plurality of packets where the first control information is located; wherein the modified first data structure specifies one or more locations in the second plurality of packets where the second control information is located.

19. The device of claim 17 , wherein the information about the first control information specifies one or more types and one or more locations of first commands in the first control information; wherein the additional information about the second control information specifies one or more types and one or more locations of commands in the second control information.

20. The device of claim 17 , wherein the first data structure comprises a plurality of fields, wherein at least one of the fields is extensible; wherein the at least one extensible field is extended by setting the value of the field to a specific value, wherein the specific value indicates to an audiovisual device that the extensible field is extended.